Tool-dismounting instrument.



No. 7||,9|2. Patented Oct. 2|, I902.

M.-STEUDNER.

- TOOL DISMOUNTING INSTRUMENT.

' (Application filed Apr. 3, 1902.

(No ModeL,

UNITED STATES PATENT OFFICE.

MARTIN STEUDNER, OF GERA-ZWGTZEN, GERMANY.

GTOOL-DISMOUNVTINIG INSTRUMENT".

SPECIFICATION forming part of Letters Patent No. 711, 12, dated October 21, 1902.

Applicationfiled April3,1902. $erialNo.101,298. some T0 aZZ whom it may concern:

Be it known that I, MARTIN STEUDNER, a subject of the Emperor of Germany, residing at Gera-Zwotzen, Germany, have invented new and useful Improvements in Tool-Dis-.

mounting Instruments, of which the following is a specification.

Bits and other tools which are connected with the machine by beinginserted or pushed into a conical seat or bushing are by such engagement to be held as nearly as possible in central position. To allow their removal from the holder, the end of the conical shaft, which generally terminates in an angular lug for the purpose of preventing rotation of the tool in the lining, is seated in or at a slot-hole, so that by driving a wedge into this slot the bit is freed or forced out. By driving the wedge into the slot, however, jars are produced which are injurious to the machine. The bearings of parts of the machine can be thereby afiected, and the bit itself can become warped and come to an angle with the butt or lug of the bit. This angle formation is particularly objectionable when so-called reduction-pieces are to be employedthat is, bushings which ,are nested one within the other for using bits of varying diameter of shaft on the same machine. When the slothole parts or the lugs have been bent to an angle, the bushings no longer run true and the tool has more and more throw, so as to be unfit for boring cylindrical holes. The same applies not only to bits, but also to cutting or shaping machines and other tools which are similarly mounted. Driving the tool out by a wedge is also objectionable, as with one hand the wedge has to be held and the hammer swung with the other, so that the tool itself during removal cannot be held and in falling can easily become injured or dull. To avoid objections of this nature, the tool according to this invention is to be forced out of its seat by spreading pliers or tongs by inserting the jaw ends of the tongs into the slot. By compressing the tongs or rather handles, and thereby spreading the jaws, the tool can be pressed out of its mounting by such tongs. As the manipulation of this instrument requires but one hand, the tool can be held by the other.

This invention is illustrated in the annexed drawings, in which Figure 1 shows the insertion of the spreadertongs into the slot. Fig. 2 shows the tongs spread and the tool removed.

The tong-legs A are pivoted, as at A, in a small flat casing A and spread by springB and are actedjon by another pair of legs 0, forming the handle of the instrument.

By a corresponding choice of the lever relation of legs A, as also of legs 0, a spreader of considerable power can be obtained.

Figs. 1 and 2 illustrate the method of removing tools with conical shaft from their bnshin g. The mouth of the spreading instrument in the arrangement shown-in Fig. 1 is inserted into the slot D of the bit-bushing E, so that it abuts against the bit-lug F on the conical shaft G of bit H. On now spreading the tongs, Fig. 2, the tool is pressed forward axially or longitudinally out of the conical seat E without any injurious pressure being exerted on the bushing or the spindle.

What I claim as new, and desire to secure by Letters Patent, is-

1. A dismounting-tool consisting of a fiat casing, a pair of tongs pivoted therein and projecting therefrom, a springinterposed between the inner end of the said tong-legs, and a leg pivoted above and below the said tonglegs and adapted to engage the inner portion of the said tong-legs.

2. In a dismonnting instrument, apair of pivoted tong -legs, a spring interposed between the same, and a leg pivoted above and below the inner portion and engaging with the said tong-legs.

3. In a dismounting instrument, a casing, a pair of tong-legs pivoted therein and projecting therefrom, a spring arranged in the said casing and interposed between the inner portion of the said tong-legs, and a leg pivoted above and below the said tong-legs within the said casing and adapted to suitably engage the inner portion of the said tong-legs.

In testimonywhereof I have hereunto set my hand in the presence of two subscribing witnesses.

MARTIN STEUDNER.

Witnesses A. BRAUTIGAM, GUSTAV MiiLLER. 

